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Side by Side Diff: ui/events/touch_transformer.h

Issue 191223007: Move touch CTM from X into Chrome (Closed) Base URL: http://git.chromium.org/chromium/src.git@master
Patch Set: fix all the unittests Created 6 years, 7 months ago
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1 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef UI_EVENTS_TOUCH_TRANSFORMER_H_
6 #define UI_EVENTS_TOUCH_TRANSFORMER_H_
7
8 #include "ui/events/events_base_export.h"
9
10 namespace ui {
11
12 // TouchTransformer is used to map touch events coordinate from screen space
13 // to root window space.
14 // When touch events are reported from kernel, its coordinate is in device
15 // space. After passing through X, its coordinate gets mapped to screen
16 // space, e.g. the framebuffer space that is the combination of multiple
17 // display outputs.
18 // In Chrome, we use TouchTransformer to remap the touch event's location from
19 // the screen space to the root window space.
20 struct EVENTS_BASE_EXPORT TouchTransformer {
sadrul 2014/05/07 20:00:27 [copying over the comments from the earlier TouchC
Yufeng Shen (Slow to review) 2014/05/07 22:02:58 Done.
21 public:
22 TouchTransformer();
23
24 float x_scale;
25 float x_offset;
26 float y_scale;
27 float y_offset;
28 };
29
30 } // namespace ui
31
32 #endif // UI_EVENTS_TOUCH_TRANSFORMER_H_
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